Question juridique clé
Whether the federal appeal against the interim order was admissible and the appellants had standing
Solution extraite
The appeal was admissible because premature disclosure abroad could have irreversible effects; the appellants had a sufficient legal interest insofar as their own assets or protected information could be disclosed.
Motifs extraits
The contested order was incidental, but a premature transfer of information could have effects equivalent to a final decision. Because the appellants invoked federal mutual assistance rules, they could challenge the issue to the extent they were entitled to object to disclosure under those rules.